B4.2.4—Holozoic nutrition
Holozoic nutrition is heterotrophic feeding by ingestion, internal digestion, absorption and assimilation of organic matter by consumers in ecosystems directly.
- Syllabus
- First assessment 2025
- Objective
- B4.2.4
- Level
- HL
Exam analysis
Chance of appearing1%of analysed past papers
Latest appearanceNovember 2019
Most common paperPaper1
Typical marks1
Common command terms
- Identify
- Outline
Scoring notes
- Common mistake
- Calling an organism heterotrophic without explaining that it feeds on organic matter.
Recent exam appearances
November 2019Paper1 ["HL"] · TZ014[ 1 ]B4.2.4—Holozoic nutrition
Practice this objective
Coverage 2019–2019 · Updated 15 Jul 2026
Concept essentials
- Holozoic organisms ingest organic matter.
- Digestion in holozoic nutrition occurs inside the organism.
- Consumers such as herbivores, carnivores and omnivores are holozoic.
- Holozoic nutrition differs from saprotrophic external digestion.